diff --git a/packages/medusa/src/api/admin/campaigns/validators.ts b/packages/medusa/src/api/admin/campaigns/validators.ts
index 2c37971505..ddd0b03612 100644
--- a/packages/medusa/src/api/admin/campaigns/validators.ts
+++ b/packages/medusa/src/api/admin/campaigns/validators.ts
@@ -26,7 +26,7 @@ export const AdminGetCampaignsParams = createFindParams({
   )
   .strict()
 
-export const CreateCampaignBudget = z
+const CreateCampaignBudget = z
   .object({
     type: z.nativeEnum(CampaignBudgetType),
     limit: z.number().nullish(),
diff --git a/packages/medusa/src/api/admin/draft-orders/validators.ts b/packages/medusa/src/api/admin/draft-orders/validators.ts
index 70196bb7c4..a008044e1a 100644
--- a/packages/medusa/src/api/admin/draft-orders/validators.ts
+++ b/packages/medusa/src/api/admin/draft-orders/validators.ts
@@ -1,4 +1,4 @@
-import { z } from "zod"
+import { z, ZodObject } from "zod"
 import { AddressPayload, BigNumberInput } from "../../utils/common-validators"
 import { createFindParams, createSelectParams } from "../../utils/validators"
 
@@ -49,8 +49,8 @@ const Item = z
     return true
   })
 
-export type AdminCreateDraftOrderType = z.infer<typeof AdminCreateDraftOrder>
-export const AdminCreateDraftOrder = z
+export type AdminCreateDraftOrderType = z.infer<typeof _AdminCreateDraftOrder>
+const _AdminCreateDraftOrder = z
   .object({
     status: z.nativeEnum(Status).optional(),
     sales_channel_id: z.string().nullish(),
@@ -67,7 +67,13 @@ export const AdminCreateDraftOrder = z
     metadata: z.record(z.unknown()).nullish(),
   })
   .strict()
-  .refine(
+
+export const AdminCreateDraftOrder = (customSchema?: ZodObject<any, any>) => {
+  const schema = customSchema
+    ? _AdminCreateDraftOrder.merge(customSchema)
+    : _AdminCreateDraftOrder
+
+  return schema.refine(
     (data) => {
       if (!data.email && !data.customer_id) {
         return false
@@ -77,3 +83,4 @@ export const AdminCreateDraftOrder = z
     },
     { message: "Either email or customer_id must be provided" }
   )
+}
diff --git a/packages/medusa/src/api/admin/promotions/validators.ts b/packages/medusa/src/api/admin/promotions/validators.ts
index e3d779b172..8060dbd3da 100644
--- a/packages/medusa/src/api/admin/promotions/validators.ts
+++ b/packages/medusa/src/api/admin/promotions/validators.ts
@@ -5,7 +5,7 @@ import {
   PromotionRuleOperator,
   PromotionType,
 } from "@medusajs/utils"
-import { z } from "zod"
+import { z, ZodObject } from "zod"
 import {
   createFindParams,
   createOperatorMap,
@@ -155,8 +155,8 @@ const promoRefinement = (promo) => {
   return true
 }
 
-export type AdminCreatePromotionType = z.infer<typeof AdminCreatePromotion>
-export const AdminCreatePromotion = z
+export type AdminCreatePromotionType = z.infer<typeof _AdminCreatePromotion>
+const _AdminCreatePromotion = z
   .object({
     code: z.string(),
     is_automatic: z.boolean().optional(),
@@ -167,14 +167,21 @@ export const AdminCreatePromotion = z
     rules: z.array(AdminCreatePromotionRule).optional(),
   })
   .strict()
+
+export const AdminCreatePromotion = (customSchema?: ZodObject<any, any>) => {
+  const schema = customSchema
+    ? _AdminCreatePromotion.merge(customSchema)
+    : _AdminCreatePromotion
+
   // In the case of a buyget promotion, we require at least one buy rule and quantities
-  .refine(promoRefinement, {
+  return schema.refine(promoRefinement, {
     message:
       "Buyget promotions require at least one buy rule and quantities to be defined",
   })
+}
 
-export type AdminUpdatePromotionType = z.infer<typeof AdminUpdatePromotion>
-export const AdminUpdatePromotion = z
+export type AdminUpdatePromotionType = z.infer<typeof _AdminUpdatePromotion>
+const _AdminUpdatePromotion = z
   .object({
     code: z.string().optional(),
     is_automatic: z.boolean().optional(),
@@ -185,8 +192,15 @@ export const AdminUpdatePromotion = z
     rules: z.array(AdminCreatePromotionRule).optional(),
   })
   .strict()
+
+export const AdminUpdatePromotion = (customSchema?: ZodObject<any, any>) => {
+  const schema = customSchema
+    ? _AdminUpdatePromotion.merge(customSchema)
+    : _AdminUpdatePromotion
+
   // In the case of a buyget promotion, we require at least one buy rule and quantities
-  .refine(promoRefinement, {
+  return schema.refine(promoRefinement, {
     message:
       "Buyget promotions require at least one buy rule and quantities to be defined",
   })
+}
diff --git a/packages/medusa/src/api/utils/__tests__/validate-body.spec.ts b/packages/medusa/src/api/utils/__tests__/validate-body.spec.ts
new file mode 100644
index 0000000000..0706172a76
--- /dev/null
+++ b/packages/medusa/src/api/utils/__tests__/validate-body.spec.ts
@@ -0,0 +1,65 @@
+import zod from "zod"
+import { MedusaError } from "@medusajs/utils"
+import { createLinkBody } from "../validators"
+import { validateAndTransformBody } from "../validate-body"
+import { MedusaRequest, MedusaResponse } from "../../../types/routing"
+
+describe("validateAndTransformBody", () => {
+  afterEach(() => {
+    jest.clearAllMocks()
+  })
+
+  it("should merge a custom validators schema", async () => {
+    let mockRequest = {
+      query: {},
+      body: {},
+    } as MedusaRequest
+
+    const mockResponse = {} as MedusaResponse
+    const nextFunction = jest.fn()
+
+    mockRequest.extendedValidators = {
+      body: zod.object({
+        brand_id: zod.number(),
+      }),
+    }
+
+    let middleware = validateAndTransformBody(createLinkBody())
+    await middleware(mockRequest, mockResponse, nextFunction)
+    expect(nextFunction).toHaveBeenCalledWith(
+      new MedusaError(
+        "invalid_data",
+        `Invalid request: Field 'brand_id' is required`
+      )
+    )
+  })
+
+  it("should pass schema to merge to the original validator factory", async () => {
+    let mockRequest = {
+      query: {},
+      body: {},
+    } as MedusaRequest
+
+    const mockResponse = {} as MedusaResponse
+    const nextFunction = jest.fn()
+
+    mockRequest.extendedValidators = {
+      body: zod.object({
+        brand_id: zod.number(),
+      }),
+    }
+
+    const validatorFactory = (schema?: Zod.ZodObject<any, any>) => {
+      return schema ? createLinkBody().merge(schema) : createLinkBody()
+    }
+
+    let middleware = validateAndTransformBody(validatorFactory)
+    await middleware(mockRequest, mockResponse, nextFunction)
+    expect(nextFunction).toHaveBeenCalledWith(
+      new MedusaError(
+        "invalid_data",
+        `Invalid request: Field 'brand_id' is required`
+      )
+    )
+  })
+})
diff --git a/packages/medusa/src/api/utils/__tests__/validate-query.spec.ts b/packages/medusa/src/api/utils/__tests__/validate-query.spec.ts
index 815e087aa8..b804473c6c 100644
--- a/packages/medusa/src/api/utils/__tests__/validate-query.spec.ts
+++ b/packages/medusa/src/api/utils/__tests__/validate-query.spec.ts
@@ -1,7 +1,10 @@
+import zod from "zod"
+import { MedusaError } from "@medusajs/utils"
 import { NextFunction, Request, Response } from "express"
+
 import { createFindParams } from "../validators"
 import { validateAndTransformQuery } from "../validate-query"
-import { MedusaError } from "@medusajs/utils"
+import { MedusaRequest, MedusaResponse } from "../../../types/routing"
 
 describe("validateAndTransformQuery", () => {
   afterEach(() => {
@@ -692,4 +695,56 @@ describe("validateAndTransformQuery", () => {
       )
     )
   })
+
+  it("should merge a custom validators schema", async () => {
+    let mockRequest = {
+      query: {},
+    } as MedusaRequest
+
+    const mockResponse = {} as MedusaResponse
+    const nextFunction = jest.fn()
+
+    mockRequest.extendedValidators = {
+      queryParams: zod.object({
+        page: zod.number(),
+      }),
+    }
+
+    let middleware = validateAndTransformQuery(createFindParams(), {})
+    await middleware(mockRequest, mockResponse, nextFunction)
+    expect(nextFunction).toHaveBeenCalledWith(
+      new MedusaError(
+        "invalid_data",
+        `Invalid request: Field 'page' is required`
+      )
+    )
+  })
+
+  it("should pass schema to merge to the original validator factory", async () => {
+    let mockRequest = {
+      query: {},
+    } as MedusaRequest
+
+    const mockResponse = {} as MedusaResponse
+    const nextFunction = jest.fn()
+
+    mockRequest.extendedValidators = {
+      queryParams: zod.object({
+        page: zod.number(),
+      }),
+    }
+
+    const validatorFactory = (schema?: Zod.ZodObject<any, any>) => {
+      return schema ? createFindParams().merge(schema) : createFindParams()
+    }
+
+    let middleware = validateAndTransformQuery(validatorFactory, {})
+    await middleware(mockRequest, mockResponse, nextFunction)
+    expect(nextFunction).toHaveBeenCalledWith(
+      new MedusaError(
+        "invalid_data",
+        `Invalid request: Field 'page' is required`
+      )
+    )
+  })
 })
diff --git a/packages/medusa/src/api/utils/validate-body.ts b/packages/medusa/src/api/utils/validate-body.ts
index 30c9dd615c..af4186f386 100644
--- a/packages/medusa/src/api/utils/validate-body.ts
+++ b/packages/medusa/src/api/utils/validate-body.ts
@@ -4,7 +4,11 @@ import { MedusaRequest, MedusaResponse } from "../../types/routing"
 import { zodValidator } from "./zod-helper"
 
 export function validateAndTransformBody(
-  zodSchema: z.ZodObject<any, any> | z.ZodEffects<any, any>
+  zodSchema:
+    | z.ZodObject<any, any>
+    | ((
+        customSchema?: z.ZodObject<any, any>
+      ) => z.ZodObject<any, any> | z.ZodEffects<any, any>)
 ): (
   req: MedusaRequest,
   res: MedusaResponse,
@@ -12,7 +16,18 @@ export function validateAndTransformBody(
 ) => Promise<void> {
   return async (req: MedusaRequest, _: MedusaResponse, next: NextFunction) => {
     try {
-      req.validatedBody = await zodValidator(zodSchema, req.body)
+      let schema: z.ZodObject<any, any> | z.ZodEffects<any, any>
+      const { body: bodyValidatorToMerge } = req.extendedValidators ?? {}
+
+      if (typeof zodSchema === "function") {
+        schema = zodSchema(bodyValidatorToMerge)
+      } else if (bodyValidatorToMerge) {
+        schema = zodSchema.merge(bodyValidatorToMerge)
+      } else {
+        schema = zodSchema
+      }
+
+      req.validatedBody = await zodValidator(schema, req.body)
       next()
     } catch (e) {
       next(e)
diff --git a/packages/medusa/src/api/utils/validate-query.ts b/packages/medusa/src/api/utils/validate-query.ts
index e9fedaa0e5..e34b335023 100644
--- a/packages/medusa/src/api/utils/validate-query.ts
+++ b/packages/medusa/src/api/utils/validate-query.ts
@@ -58,7 +58,11 @@ const getFilterableFields = <T extends RequestQueryFields>(obj: T): T => {
 }
 
 export function validateAndTransformQuery<TEntity extends BaseEntity>(
-  zodSchema: z.ZodObject<any, any> | z.ZodEffects<any, any>,
+  zodSchema:
+    | z.ZodObject<any, any>
+    | ((
+        customSchema?: z.ZodObject<any, any>
+      ) => z.ZodObject<any, any> | z.ZodEffects<any, any>),
   queryConfig: QueryConfig<TEntity>
 ): (
   req: MedusaRequest,
@@ -70,7 +74,19 @@ export function validateAndTransformQuery<TEntity extends BaseEntity>(
       const allowed = (req.allowed ?? queryConfig.allowed ?? []) as string[]
       delete req.allowed
       const query = normalizeQuery(req)
-      const validated = await zodValidator(zodSchema, query)
+
+      let schema: z.ZodObject<any, any> | z.ZodEffects<any, any>
+      const { queryParams: queryParamsToMerge } = req.extendedValidators ?? {}
+
+      if (typeof zodSchema === "function") {
+        schema = zodSchema(queryParamsToMerge)
+      } else if (queryParamsToMerge) {
+        schema = zodSchema.merge(queryParamsToMerge)
+      } else {
+        schema = zodSchema
+      }
+
+      const validated = await zodValidator(schema, query)
       const cnf = queryConfig.isList
         ? prepareListQuery(validated, { ...queryConfig, allowed })
         : prepareRetrieveQuery(validated, { ...queryConfig, allowed })
diff --git a/packages/medusa/src/types/routing.ts b/packages/medusa/src/types/routing.ts
index 55b3c21437..0f604ea156 100644
--- a/packages/medusa/src/types/routing.ts
+++ b/packages/medusa/src/types/routing.ts
@@ -1,3 +1,4 @@
+import { ZodObject } from "zod"
 import type { NextFunction, Request, Response } from "express"
 
 import {
@@ -61,6 +62,14 @@ export interface MedusaRequest<Body = unknown>
    * A generic context object that can be used across the request lifecycle
    */
   context?: Record<string, any>
+  /**
+   * Custom validators for the request body and query params that will be
+   * merged with the original validator of the route.
+   */
+  extendedValidators?: {
+    body?: ZodObject<any, any>
+    queryParams?: ZodObject<any, any>
+  }
 }
 
 export interface AuthContext {